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    Re: instances of the use of "horizon grazing" technique
    From: Byron Franklin
    Date: 2009 Oct 23, 08:00 -0700

     Close to what you want is "Secrets of the Viking Navigators" by LEIFK
    KARLSEN.
    It includes: SKY CLOCK, CIRCUMPOLAR STARS, Star that run close to the
    horizon for keeping latitude.
    Saling the LAT. You may get it from " STARPATH." I use my Star Finder
    to see how it works.
    
    
    On Oct 6, 8:13�pm, Peter Fogg  wrote:
    > A little more on this:
    >
    > 'Given the right situation, one could even put the twilight information in
    > the Nautical Almanac to other uses. For example, in December 1983, Marvin
    > Creamer, aboard the sailing vessel Globe Star,rounded Cape Horn, marking the
    > halfway point in his "instrumentless" circumnavigation. This safe passage of
    > Cape Horn was done using a technique one might call "latitude by twilight."
    >
    > Creamer used no instruments (not even a compass), but he did know that
    > during the middle and end of December, Earth's position relative to the sun
    > would produce a twilight between 56.5� S and 66.5� S latitude that would
    > last all night.
    >
    > Cape Horn is located at about latitude 55.5� S. Therefore, as long as Globe
    > Star was sailed far enough south to remain in continual twilight, and did
    > not see complete darkness, the latitude would be below 55.5� S and Globe
    > Star could sail safely to the easthence the "latitude by twilight"
    > technique.'http://www.oceannavigator.com/ME2/dirmod.asp?sid=&nm=&type=Publishing...
    >
    >
    >
    > On Wed, Oct 7, 2009 at 11:08 AM, Peter Fogg  wrote:
    > > "*Marvin Creamer* (born January 24,
    > > 1916 ) is an amateur 
    American
    > > sailor  noted for having sailed
    > > around the globe without the aid of 
    navigationalinstruments. From 21
    > > December  1982until 17
    > > May  1984,
    > > a total of 510 days at sea, Creamer and the crew of his 36' boat *Globe
    > > Star* circumnavigated  the
    > > globe with no nautical aids, not even a compassor
    > > watch ."
    > >http://en.wikipedia.org/wiki/Marvin_Creamer
    >
    > > I seem to remember that his tale was told in the very first issue of 'Ocean
    > > Navigator'. �There may also have been a book..?
    >
    > > On Wed, Oct 7, 2009 at 10:54 AM, Lu Abel  wrote:
    >
    > >> About a decade ago an adventurer did a single-handed circumnavigation
    > >> with absolutely NO navigation instruments. � I remember that he timed
    > >> his passage of Cape Horn to allow him to judge that he was at a safe
    > >> south latitude by this "horizon grazing" technique. � Unfortunately I
    > >> have no further recollection of the name of the boat or its skipper.
    >
    > >> Lu Abel
    >
    > >> Apache Runner wrote:
    >
    > >> > A number of emergency navigation sources talk about finding (very
    > >> > rough) latitude by looking at the minimum altitude of horizon grazing
    > >> > stars. � �I'm unaware of anyone that has actually used this technique,
    > >> > but perhaps someone has used it in a real (as opposed to trial)
    > >> > situation. � Any anecdotes or historical citations of this being used?
    >
    > >> > John Huth- Hide quoted text -
    >
    > - Show quoted text -
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